/Engine/Source/Runtime/Engine/Classes/Kismet/BlueprintPathsLibrary.h
Gets the extension for this filename.
the extension of this filename, or an empty string if the filename doesn't have an extension.
static [FString](API\Runtime\Core\Containers\FString) GetExtension ( const [FString](API\Runtime\Core\Containers\FString) & InPath, bool bIncludeDot )